java通用后台管理系统.zip

/******************************************************************************* * Copyright (c) 2005, 2014 springside.github.io * * Licensed under the Apache License, Version 2.0 (the "License"); *******************************************************************************/ package com.yuzhi.back.utils; import org.apache.commons.lang3.StringUtils; import org.apache.commons.lang3.Validate; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.lang.reflect.*; /** * 反射工具类. * * 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数. * * @author calvin * * code from springside4 */ @SuppressWarnings(value={"unchecked", "rawtypes"}) public class Reflections { private static final String SETTER_PREFIX = "set"; private static final String GETTER_PREFIX = "get"; private static final String CGLIB_CLASS_SEPARATOR = "$$"; private static Logger logger = LoggerFactory.getLogger(Reflections.class); /** * 调用Getter方法. */ public static Object invokeGetter(Object obj, String propertyName) { String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(propertyName); return invokeMethod(obj, getterMethodName, new Class[] {}, new Object[] {}); } /** * 调用Setter方法, 仅匹配方法名。 */ public static void invokeSetter(Object obj, String propertyName, Object value) { String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(propertyName); invokeMethodByName(obj, setterMethodName, new Object[] { value }); } /** * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数. */ public static Object getFieldValue(final Object obj, final String fieldName) { Field field = getAccessibleField(obj, fieldName); if (field == null) { throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]"); } Object result = null; try { result = field.get(obj); } catch (IllegalAccessException e) { logger.error("不可能抛出的异常{}", e.getMessage()); } return result; } /** * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数. */ public static void setFieldValue(final Object obj, final String fieldName, final Object value) { Field field = getAccessibleField(obj, fieldName); if (field == null) { throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]"); } try { field.set(obj, value); } catch (IllegalAccessException e) { logger.error("不可能抛出的异常:{}", e.getMessage()); } } /** * 直接调用对象方法, 无视private/protected修饰符. * 用于一次性调用的情况，否则应使用getAccessibleMethod()函数获得Method后反复调用. * 同时匹配方法名+参数类型， */ public static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes, final Object[] args) { Method method = getAccessibleMethod(obj, methodName, parameterTypes); if (method == null) { throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]"); } try { return method.invoke(obj, args); } catch (Exception e) { throw convertReflectionExceptionToUnchecked(e); } } /** * 直接调用对象方法, 无视private/protected修饰符， * 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用. * 只匹配函数名，如果有多个同名函数调用第一个。 */ public static Object invokeMethodByName(final Object obj, final String methodName, final Object[] args) { Method method = getAccessibleMethodByName(obj, methodName); if (method == null) { throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]"); } try { return method.invoke(obj, args); } catch (Exception e) { throw convertReflectionExceptionToUnchecked(e); } } /** * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问. * * 如向上转型到Object仍无法找到, 返回null. */ public static Field getAccessibleField(final Object obj, final String fieldName) { Validate.notNull(obj, "object can't be null"); Validate.notBlank(fieldName, "fieldName can't be blank"); for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) { try { Field field = superClass.getDeclaredField(fieldName); makeAccessible(field); return field; } catch (NoSuchFieldException e) {// NOSONAR // Field不在当前类定义,继续向上转型 } } return null; } /** * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问. * 如向上转型到Object仍无法找到, 返回null. * 匹配函数名+参数类型。 * * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args) */ public static Method getAccessibleMethod(final Object obj, final String methodName, final Class<?>... parameterTypes) { Validate.notNull(obj, "object can't be null"); Validate.notBlank(methodName, "methodName can't be blank"); for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) { try { Method method = searchType.getDeclaredMethod(methodName, parameterTypes); makeAccessible(method); return method; } catch (NoSuchMethodException e) { // Method不在当前类定义,继续向上转型 } } return null; } /** * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问. * 如向上转型到Object仍无法找到, 返回null. * 只匹配函数名。 * * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args) */ public static Method getAccessibleMethodByName(final Object obj, final String methodName) { Validate.notNull(obj, "object can't be null"); Validate.notBlank(methodName, "methodName can't be blank"); for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) { Method[] methods = searchType.getDeclaredMethods(); for (Method method : methods) { if (method.getName().equals(methodName)) { makeAccessible(method); return method; } } } return null; } /** * 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。 */ public static void makeAccessible(Method method) { if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers())) && !method.isAccessible()) { method.setAccessible(true); } } /** * 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。 */ public static void makeAccessible(Field field) { if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier .isFinal(field.getModifiers())) && !field.isAccessible()) { field.setAccessible(true); } } /** * 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处 * 如无法找到, 返回Object.class. * eg. * public UserDao extends HibernateDao<User> * * @param clazz The class to introspect * @return the first generic declaration, or Object.class if cannot be determined */ public static <T> Class<T> getClassGenricType(final Class clazz) { return getClassGenricType(clazz, 0); } /** * 通过反射, 获得Class定义中声明的父类的泛型参数的类型. * 如无法找到, 返回Object.class. * * 如public UserDao extends HibernateDao<User,Long> *